KR20020006909A - Advanced wastewater treatment process with the parallel internal recycle - Google Patents

Abstract

PURPOSE: An advanced wastewater treatment process with parallel internal recycle is provided to remove nitrogen and phosphorus simultaneously. A portion of treated wastewater in primary aerobic reactor and second aerobic reactor is recycled to primary anoxic reactor for denitrification and organics removal. A portion of effluent of primary anaerobic reactor is recycled to primary anoxic reactor for recirculation. And a portion of treated wastewater in the second aerobic reactor is recycled to primary anoxic reactor. Therefore, by parallel recycles, nitrogen and phosphorus of wastewater are removed simultaneously. CONSTITUTION: The process includes: an aerobic reactor(10) for removing organics and releasing phosphorus; a primary anoxic reactor(12) for denitrification and removing organics; a primary aerobic reactor(14) for nitrification and phosphorus uptake; a second anoxic reactor(16) for denitrification; a second aerobic reactor(18) for uptake of phosphorus residues and denitrification of residual ammonia nitrogen; and a clarifier(20) sludge separation.

Description

Advanced wastewater treatment process with the parallel internal recycle}

The present invention relates to an advanced sewage treatment apparatus using a parallel internal transport, and more particularly, in the advanced sewage treatment method using microorganisms, the internal transport for transporting an effluent from an aerobic tank to an anoxic tank is configured in parallel to treat nitrogen. The present invention relates to a device that allows to increase and to remove organic matter and sidewalks in waste water at the same time.

In general, the advanced sewage treatment methods used in the prior art only nitrate ammonia in an aerobic tank to remove nitrogen, and denitrify nitric oxide compounds in an anoxic tank to remove nitrogen in the form of nitrogen gas. It is difficult to satisfy the water quality stably against fluctuations in water quality and fluctuations in water temperature because of the use, or there is a problem that the facility is largely designed unnecessarily.

The present invention has been made to solve the above problems, the purpose of which is stable to the change of nitrogen pollutant load of the water quality or seasonal water temperature change even in a small scale reactor through the efficient recycling of the reaction solution using the parallel internal transfer It is to provide a device for removing nitrogen and to facilitate the removal of organic matter and phosphorus.

In order to achieve the above object, the present invention provides a part of the sludge through the internal transfer pump and the external transfer pump in the process of inflow of the inflow water into the anaerobic reactor and outflow into the precipitation tank through the anaerobic reactor and the aerobic reactor. It is achieved by providing an advanced sewage treatment apparatus to completely remove organics and phosphorus by transporting it to and then treating it again.

1 is a process diagram of an advanced sewage treatment apparatus using a parallel internal transfer of the present invention

<Description of the symbols for the main parts of the drawings>

(10): anaerobic reactor 12: anoxic reactor

(14): before aerobic reactor 16: after anoxic reactor

(18): after aerobic reactor 20: sedimentation tank

(22): influent (24): supernatant

(26): before internal transfer pump (28): after internal transfer pump

(30): external conveying pump (32): sludge waste pump

Hereinafter, the configuration and operation of the present invention with reference to the accompanying drawings.

1 shows a process diagram of an advanced sewage treatment apparatus using a parallel internal transport of the present invention, in the construction of an advanced sewage treatment apparatus using a parallel internal transport, an anaerobic reactor 10 and an anoxic reactor 12 In the advanced sewage treatment process consisting of the pre-aerobic reactor 14, the post-anoxic reactor 16, the post-aerobic reactor 18 and the settling tank 20, the inflow water 22 is introduced into the anaerobic reactor 10 and the pre-oxygen reactor (12) and the pre-aerobic reactor (14), after the anaerobic reactor (16) and the post-aerobic reactor (18) to precipitate the sludge in the settling tank 20 and discharge the supernatant water 24, but a part of the sludge is an external conveying pump ( 30) to the anaerobic reactor 10.

In addition, a recirculation line is installed in the pre-aerobic reactor 14 and the post-aerobic reactor 18 so as to be transferred to the pre-oxygen reaction tank 12 by the pre-inner pump 26 and the post-inner pump 28. .

Another embodiment of the present invention will be described as follows.

Example

First, the influent 22 can be simultaneously or selectively supplied to the anaerobic reactor 10, the anoxic reactor 12, and the aerobic reactor 14.

Secondly, the anaerobic reactor 10 is divided into two or more stages, and the external transport is the first stage of the anaerobic reactor 10, and the inflow of the inlet 22 can be supplied to the next stage.

Third, fixed or fluidized bed media is installed or added simultaneously or selectively to the anaerobic reactor (10), the entire anoxic reactor (12), the aerobic reactor (14), the after aerobic reactor (16), and the aerobic reactor (18). .

Fourth, the external carbon source (methanol, acetic acid, primary sedimentation tank sludge and its fermentation broth, etc.) for the purpose of denitrification is simultaneously or selectively supplied to the anaerobic reactor 10 or the entire anoxic reactor 12 and the subsequent anoxic reactor 16. do.

Fifth, the process of adding a chemical for the precipitation of phosphorus in the anaerobic reactor (10), the pre-oxygen reaction tank (12), the pre-aerobic reactor (14), the post anaerobic reactor (16), the post aerobic reactor (18) and all connecting pipes to be.

The operation of the present invention will be described with reference to the above configuration.

As described above, the present invention introduces organic matter, nitrogen and phosphorus influent 22 into the anaerobic reactor 10 to induce the removal of organic matter and release of phosphorus in the influent 22, and the effluent of the anaerobic reactor 10 is an internal transfer pump. (26) and the internal return water containing a large amount of nitrate nitrogen from the pre-aerobic reaction tank 14 and the post-aerobic reaction tank 18 by the internal internal pump (28) to the entire anoxic reaction tank 12 to remove organic matter and denitrification. Induces oxidation

The effluent of the entire anoxic reactor 12 is introduced into the aerobic reactor 14 to induce nitrification of ammoniacal nitrogen and to induce the absorption of released phosphorus.

The effluent of the pre-aerobic reactor 14 is discharged to the entire anoxic reactor 12 through the internal transfer line at a constant flow rate by the former internal transfer pump 26 for partial recirculation flow, and the remaining effluent is passed to the anoxic reactor 16 afterwards. Induction to induce denitrification of nitrate nitrogen.

The effluent from the post-oxygen reactor 16 is introduced into the post-aerobic reactor 18 to induce nitrification of residual ammonia nitrogen and the absorption of residual release phosphorus in the solution, and the effluent from the post-aerobic reactor 18 is partially recycled. To this end, the internal transfer pump 28 discharges the entire anoxic reaction tank 12 through the internal transfer line at a constant flow rate, and the remaining effluent flows into the settling tank 20 and in the settling tank 20, nitrogen, phosphorus, intake and organic matter. The sludge generated during the decomposition is precipitated and the treated supernatant 24 is discharged.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

In the above process, the effect of the parallel internal transfer of the present invention can reduce the size of the aerobic reactor, and the conventional process is capable of treating nitrogen only when all nitrification is performed in the aerobic reactor. Even though the reacted ammonia reaches the aerobic reactor after nitrification, it is discharged in the form of nitrate compound, so the nitrogen is not removed and the size of the aerobic reactor must be large, but the nitrification in the aerobic reactor after the parallel internal transfer of the present invention is required. The reaction solution can be transferred to the position of the entire anoxic reaction tank so that it can be denitrated in the anoxic reaction tank and the after anoxic reaction tank to remove the nitrate compounds nitrified in the aerobic reaction tank, thus performing the entire amount of nitrification in the aerobic reaction tank. I do not need to do The size of the reactor can be reduced, and therefore, the process of the present invention is that the aerobic reactor in the conventional process was limited to maintaining aerobic conditions for the absorption of phosphorus. It is a very useful invention that makes it possible.

Claims (1)

Inflow water 22 is introduced into the anaerobic reactor 10 and the sludge is precipitated in the settling tank 20 through the entire anoxic reactor 12, the aerobic reactor 14, the after anoxic reactor 16 and the aerobic reactor 18. And discharge the supernatant water 24, but transfer part of the sludge to the anaerobic reactor 10 by the external transfer pump 30, and install a recirculation line in the former aerobic reactor 14 and the post aerobic reactor 18 An advanced sewage treatment apparatus using parallel internal conveying, characterized in that the conveying pump (26) and the post-internal conveying pump (28) are conveyed to the entire anoxic reaction tank (12).